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What really happens to Connect CDC during IBM Power upgrades and IBMi 7.5 moves? (…is your CDC getting the love it deserves? 😄)

  • 1.  What really happens to Connect CDC during IBM Power upgrades and IBMi 7.5 moves? (…is your CDC getting the love it deserves? 😄)

    Employee
    Posted 4 hours ago
    Edited by Shivang Joshi 3 hours ago

    What I ran into

    Recently came across a scenario where both were planned together:

    • Power9 → Power10 migration
    • IBMi 7.4 → 7.5 upgrade

    Simple question: Will CDC just keep working?

    Hardware move – smooth sailing

    For a hardware-only migration, CDC is pretty relaxed:

    "Change the server, I'll still replicate."

     

    Since CDC depends on journals and receivers, and they remain unchanged, replication typically resumes without issues.

    Still, validation post-migration is always a good idea.

    OS upgrade – a different story

    This is where things shift.

    Try upgrading to IBMi 7.5 while on CDC 5.7, and CDC reacts like:

    "You upgraded everyone… except me?"

     

    Because:

    • CDC 5.7 is NOT supported on IBMi 7.5
    • You need CDC 5.8.04+ before upgrading the OS 

    Quick reality check before upgrading

    • Stop Change Selectors
    • Drain queues
    • Stop Replication
    • Shut down kernels
    • Upgrade → restart → validate

    Skipping these seems small… until it isn't.

    What stood out

    • Hardware upgrades are forgiving
    • OS upgrades demand preparation

    CDC is reliable - but only if you treat it right 😉

    Your turn

    Do you plan hardware and OS changes separately, or bundle them together and hope CDC behaves the same?

    Anyone else seen "OS upgrade surprises"? 😄



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    Shivang Joshi
    *Precisely Software Inc.
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  • 2.  RE: What really happens to Connect CDC during IBM Power upgrades and IBMi 7.5 moves? (…is your CDC getting the love it deserves? 😄)

    Employee
    Posted 2 hours ago

    We have seen some customers ask whether any CDC changes are required for Power migrations. In most cases the hardware move itself is straightforward, but validating journaling, Change Selectors, replication status, etc after the migration has always been an important step. I am curious whether anyone has encountered issues caused by environmental changes (hostnames, networking, storage, etc) rather than CDC itself during a Power upgrade



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    Sathya LJK
    *Precisely Software Inc.
    ------------------------------